'17 Hyundai Elantra weird cold start only when cold out - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

AZIROC · 01-09-2021, 02:43 AM

Wifes '17 Elantra (2.0 N/A engine) started having this issue about a month ago. If her car is parked outside at night (she's a 3rd shift nurse) and its cold out (mid 40s and below)when she goes to start it up in the morning it has a loud "noise" coming from it. I finally got it to do it for me tonight and its almost like an exhaust leak...but not. almost like an exhaust amplifier.

The idle is higher than normal at first (normal on a cold start) and settles down within maybe 30 secs. For this issue, the noise makes it sound like I installed a "tuner exhaust" but coming from the engine bay, not the back. the noise is there till the idle goes back to normal. When it's warmed up (2-3 mins maybe) the noise goes away.

The kicker is if its parked in the *enclosed* garage at home and it even gets down to the 30s at night, it won't do it in the mornings. Its only when its parked outside, unprotected. I had the dealer do an oil change and check the codes (engine and body) and nothing was there. I also changed out the plugs and filters since they were due anyway. ** normally I do all that but she had a free oil change. And then they wanted to changed me $175 to install an air filter and cabin filter and $300 for plugs.

Any ideas where else I can look? My next chance I'm going to leave the car parked outside and in the morning pop the hood and start it to see if I can get a better idea where the noise is coming from.

90503 · 01-09-2021, 12:02 PM

Personally, if it goes away and runs fine, I wouldn't worry about it.

My '17 V-6 Impala sounds like a sick calf for about a minute on colder mornings, but smooths out relatively quickly. What it goes through on start up, I have no idea. I thought about having it checked out when it was new, but never did. It's been behaving the same for three years now and runs just fine.

Good luck.

95 imp · 01-09-2021, 01:46 PM

Perhaps the exhaust manifold or the connection to the exhaust is just a little loose. When cold, it shrinks enough to leak. As it warms up, the metal expands and reseals the leak.

AZIROC · 01-09-2021, 02:07 PM

Quote:

Originally Posted by 95 imp

Perhaps the exhaust manifold or the connection to the exhaust is just a little loose. When cold, it shrinks enough to leak. As it warms up, the metal expands and reseals the leak.

Just because of the exhaust noise, this is what im thinking.

AZIROC · 01-09-2021, 02:08 PM

Quote:

Originally Posted by 90503

Personally, if it goes away and runs fine, I wouldn't worry about it.

My '17 V-6 Impala sounds like a sick calf for about a minute on colder mornings, but smooths out relatively quickly. What it goes through on start up, I have no idea. I thought about having it checked out when it was new, but never did. It's been behaving the same for three years now and runs just fine.

Good luck.

Agreed. Thats what we have been doing now. Just odd is started a month ago but she's been parking outside for years.

s346k · 01-10-2021, 02:24 PM

di motor? they sound like that when they're cold.

01-09-2021, 02:43 AM	#1
AZIROC Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019 Location: Arizona Posts: 731	'17 Hyundai Elantra weird cold start only when cold out Wifes '17 Elantra (2.0 N/A engine) started having this issue about a month ago. If her car is parked outside at night (she's a 3rd shift nurse) and its cold out (mid 40s and below)when she goes to start it up in the morning it has a loud "noise" coming from it. I finally got it to do it for me tonight and its almost like an exhaust leak...but not. almost like an exhaust amplifier. The idle is higher than normal at first (normal on a cold start) and settles down within maybe 30 secs. For this issue, the noise makes it sound like I installed a "tuner exhaust" but coming from the engine bay, not the back. the noise is there till the idle goes back to normal. When it's warmed up (2-3 mins maybe) the noise goes away. The kicker is if its parked in the enclosed garage at home and it even gets down to the 30s at night, it won't do it in the mornings. Its only when its parked outside, unprotected. I had the dealer do an oil change and check the codes (engine and body) and nothing was there. I also changed out the plugs and filters since they were due anyway. ** normally I do all that but she had a free oil change. And then they wanted to changed me $175 to install an air filter and cabin filter and $300 for plugs. Any ideas where else I can look? My next chance I'm going to leave the car parked outside and in the morning pop the hood and start it to see if I can get a better idea where the noise is coming from.

01-09-2021, 01:46 PM	#3
95 imp Dumb Ass Deluxe Drives: A Tricked Out Mountain Bike Join Date: Jun 2019 Location: Arizona Posts: 1,959	Perhaps the exhaust manifold or the connection to the exhaust is just a little loose. When cold, it shrinks enough to leak. As it warms up, the metal expands and reseals the leak. __________________

01-10-2021, 02:24 PM	#6
s346k Drives: like an old lady Join Date: Jun 2012 Location: indiana Posts: 2,395	di motor? they sound like that when they're cold. __________________ 2016+ camaro: everyone’s first car

01-09-2021, 12:02 PM	#2
90503 Drives: 2011 2SS/RS LS3 Join Date: Nov 2011 Location: Torrance Posts: 14,419	Personally, if it goes away and runs fine, I wouldn't worry about it. My '17 V-6 Impala sounds like a sick calf for about a minute on colder mornings, but smooths out relatively quickly. What it goes through on start up, I have no idea. I thought about having it checked out when it was new, but never did. It's been behaving the same for three years now and runs just fine. Good luck.